The rendered image looks clipped, but in the viewport the clip distance seems OK
This is because Clipping Distance settings exist in two places. 

One set for the viewport (in your Properties Panel):



...and another for the Camera / rendering:



Edit:

However...

Now that you've posted your .blend and I've had a chance to examine it, I can say your issue has nothing to do with clipping distance.

You have a SubSurf Modifier on your plane that is curving it.



It was set only to be visible in renders, not in the viewport.

Edit again:

I just saw your comment that you fixed it, so never mind. One last thing I'll mention - you can leave the SubSurf Modifier on, but switch it to Simple instead of Catmull-Clark, and this will give you the fine geometry for the Displace Modifier that follows, without rounding your plane.